Answer:
The coefficient of kinetic friction between the puck and the ice is 0.11
Explanation:
Given;
initial speed, u = 9.3 m/s
sliding distance, S = 42 m
From equation of motion we determine the acceleration;
v² = u² + 2as
0 = (9.3)² + (2x42)a
- 84a = 86.49
a = -86.49/84
|a| = 1.0296
= ma
where;
Fk is the frictional force
μk is the coefficient of kinetic friction
N is the normal reaction = mg
μkmg = ma
μkg = a
μk = a/g
where;
g is the gravitational constant = 9.8 m/s²
μk = a/g
μk = 1.0296/9.8
μk = 0.11
Therefore, the coefficient of kinetic friction between the puck and the ice is 0.11
The formula we use
here is:
radial acceleration =
ω^2 * R <span>
110,000 * 9.81 m/s^2 = ω^2 * 0.073 m
<span>ω^2 = 110,000 * 9.81 / 0.073
ω = 3844.76 rad/s </span></span>
<span>and since: ω = 2pi*f --> f = ω/(2pi)</span><span>
f = 3844.76 / (2pi) = 611.91 rps = 611.91 * 60 rpm
<span>= 36,714.77 rpm </span></span>
Explanation:
Mitochondria are essential parts of many eukaryotes, but they are useless without oxygen. Therefore, chloroplasts are extremely important. They produce breathable air for life. Root hairs are seen to not have chloroplasts as their job is to collect water and nutrients.
<h2>
<em><u>BRAINILIEST</u></em><em><u> </u></em><em><u>PLEASE</u></em><em><u> </u></em></h2>
The total oxygen atoms that are exprected in the vinegar and baking soda reaction is three oxygen atoms.
Answer: B. 3
why;live
Answer:
1.89*10^8 J
Explanation:
The coefficient of performance of this device is 
where Q .is the useful heat supplied or removed by the considered system and W is the work required by the considered system.
Step 1
Coeffiecient of perfromance for cooling (COPC) = 1.75 = .
Q = 1.75W
Step 2
We convert day into seconds:
1 day = 24 hrs = 86400 seconds
Step 3
Heat that can be extracted from the house in a day is:
Q = 1.75 * 1.25 * 10^3 * 86400 = 189000000 = 1.89*10^8 J
